Thank you for your very informative and detailed discussion of how watches work, I appreciate you taking the time to share the knowledge gained form years of experience. I have to agree with you, this watch is performing well within its design specifications I was just curious about why the somewhat sudden change in performance.

I do have another theory to propose. My wife and I have a small farm and during the summer we raise produce to sell at a local farmers market. We are not big enough to have all the modern farm equipment so
its a very labor intensive effort. And to answer the old question "can I wear my Rolex while ..." yes I do wear it while farming. I have to expect all this manual effort keeps the drive train fully wound all the time. After the growing season there is still much to be done in preparation for the spring and we finally get a chance to relax in the fall.
I am not nearly as active now so have to assume the drive train is only partially wound and I recall reading that can cause a watch to run a little fast. Does that make sense? The watch has never stopped nor do I ever have to manually wind it.

I also have to agree it may be time to let RSC put it back in like new condition and knowing what they do does justify their cost.